壁函数

基于紊流随机理论，采用了各向异性紊流的Reynolds应力数值格式和自由面位置的压力Poisson方程，并将精细壁函数应用于边壁处理。

Stochastic turbulence theory was used to develop a numerical model of the Reynolds stresses for anisotropic turbulent flows that was solved with a pressure Poisson equation for the free surface flow . A refined wall function was used to treat the solid wall boundaries .

周期性振荡湍流的壁函数研究和数值实验

Development of Near Wall Function for Periodic Oscillating Turbulent Flow and Numerical Experiment

本文给出了一般形式的湍流壁函数。

The general form of turbulent wall - functions is presented .

紊流模型中壁函数关系的改进

Improvement of wall function in turbulence models

平面二维k-ε紊流模型不同壁函数的对比及研究

Comparison and research on several wall functions in plane two-dimension k - ε turbulence model

最后采用了标准k-ε紊流模型和壁函数模拟了试验水槽内的水流运动，用数值计算结果与实测结果进行比较，结果基本相符。

Lastly , simulating the flow by employing the k-e turbulence model , and comparing the two ways , the results are almost accordant .

并在非交错网格系下采用SIMPLE算法和混合差分格式求解离散方程，利用壁面函数处理固壁边界条件。

SIMPLE algorithm and hybrid scheme were used . Wall function was applied to treating near wall region .

计算中采用kε两方程模型，利用区域扩充方法来模拟复杂的几何形状，并进行了耦合计算，对流体区域内的阶梯形固体边界提出了一种实施壁面函数法的方法。

The domain extension method was adopted and conjugated computation was conducted . Implementation of wall function method was proposed for analyzing the step wise solid boundaries in the fluid region .

对于数值模拟，文中假设采用标准的湍流模型，标准的近壁面函数，SIMPLE算法，且湍流动能、湍流耗散项、动量方程都采用一阶迎风格式离散。

ε standard turbulent model , standard Wall Function , SIMPLE method are adopted in this numerical simulation , and the Turbulence Kinetic Energy , Turbulence Dissipation Rate , Momentum Equation adopt First Order Upwind difference scheme for discreteness .

为了平衡计算时间和计算资源，这些CFD软件通常利用壁面函数计算缸内传热过程。

In order to balance the computing time and computing resources , these CFD software usually use wall function to simulate the cylinder heat transfer process .

结合质量、动量、能量守恒方程及κ-ε模型、壁面函数法等理论，利用FLUENT软件模拟了系统运行时湖水水温的分布情况。

Combined with mass , momentum , energy conservation equation and κ - ε model , wall function method theory , we simulated the distribution of water temperature by using FLUENT .

最后，建立了三维可压缩雷诺平均Navier-Stokes方程、给出了标准的κ-ε两方程模型和标准壁面函数。

Finally , the Navier-Stokes equations for 3-D compressible turbulent flow were constructed and also the standard k - ε equations and standard wall functions were given .

考虑到可压缩和热传导效应的壁面函数边界条件，被耦合到了采用k-ω两方程湍流模型、用有限体积法求解N-S方程的程序中。

Wall function boundary condition considering heat transfer and compressibility was coupled in N-S codes which use finite volume method and two equations k - ω turbulence model .

本文通过基于时均NS方程（雷诺方程）及标准Kε湍流模型，采用非结构网格划分，速度进口、自由出流边界条件，无滑移条件，用壁面函数法处理近壁流动；

A new scheme was developed in this paper on the basis of N-S equation and standard k-s model . Near-wall flow was resolved by wall function with the application of sliding net model , velocity inlet , free outlet boundary , non-slip velocity condition ;

与以往的湍流模型不同，GAO-YONG不可压湍流控制方程组不需要任何经验系数及壁面函数。

Unlike widely used turbulence models , the GAO-YONG model equations use no empirical coefficients or wall functions .

应用标准k-ε湍流模型加壁面函数法对低比转数冲压多级离心泵叶轮内的三维湍流流动进行了时均N-S方程的数值计算。

The time-averaged Navier-Stokes equations of three-dimensional turbulence flow in impeller of stamping multistage centrifugal pump are calculated by CFD based on the standard k - ε turbulence model and wall function .

通过与实验结果以及BL模型计算结果的比较，表明不需要任何经验系数及壁面函数的GAO-YONG不可压湍流模型方程组能够对有压力梯度的湍流流动做出更好的预测。

All the results further verify the adaptability of the GAO-YONG turbulence model , without using empirical coefficients and wall functions , to real turbulent flow with pressure gradient .

计算数据与试验值比较表明，采用三层壁面函数的RNGk-ε模型更适用于模拟三维两相燃烧流场。

Computations are in fairly good agreement with experiments . The comparison indicates that RNG k - ε turbulent model with three-layer wall function is more reliable for modeling 3-D spray combustion flow field .

详细分析了纳维-斯托克斯方程（简称N-S方程）等基本控制方程、雷诺时均方程及其标准的k-ε模型、大涡模拟方法和壁面函数与近壁模型。

The governing equation such as Navier-Stokes ( N-S ) equation , the Reynolds time-averaged equa-tions and its standard k - ε model , the Large eddy simulation ( LES ) method , the wall function and near wall model are analyzed in detail .

考虑可压缩与热传导的壁面函数边界条件及其应用

Application of wall function boundary condition considering heat transfer and compressibility

边界条件的处理采用壁面函数法。

The boundary condition is wall function .

采用在任意曲线坐标系统下的壁面函数来处理加力燃烧室的筒体和隔热屏壁面附近区域流动。

In arbitrary curvilinear coordinates , the wall function is used for treating near wall regions .

计算方法还包括K-ε湍流模型和壁面函数法等措施。

K - ε turbulence model and wall function method were included in the calculation method .

一种新的壁面函数

A new wall - function

考虑了高Re数k&ε模型和壁面函数法边界条件的处理问题。

The high Re number k - ε model and boundary condition of wall function method are considered .

在壁面函数中引入无量纲壁面粗糙度以考虑粗糙壁面的影响。

The dimensionless wall roughness was introduced into the wall function to consider the influence of the rough wall .

针对这一问题，修正了亚格子雷诺应力模型的壁面函数，得到了较好的计算结果。

To this end , the wall function of the sub-grid Reynolds stress model was modified to obtain a better result .

对于管内流场的描述，采用标准的k-ε湍流模型和壁面函数法。

For the description of the flow field , the standard k - ε turbulence model and the wall function were used .

第二章介绍流动的时间迭代求解方法以及本文采用的先进壁面函数边界条件，验证了壁面函数边界条件在亚跨声速和超声速流动中的准确性以及本文采用的热完全气体模型。

In chapter 2 , time iterating algorithms are introduced and wall function boundary conditions and thermally perfect gas model are validated .

同时，针对三种太阳能烟囱模型的流动和计算特点，选用了不同种类的κ-ε湍流模型和壁面函数法进行数值计算。

According to the flow patterns and calculation characteristics for three models , different k - s turbulence models and wall function methods were used .